This letter was written by James rather that to him and it was written to all Christians everywhere rather than in a specific location James was based in Jerusalem, where politics between the Jews and the Romans had become pretty tense. Yet he makes it very clear that no matter what our situation if we follow Jesus, we can't live like people who don't.
This is a brilliant letter. It's hugely practical and talks about the importance of living out our faith in the world. It's very direct, but if you want a life that looks more like the life of Jesus, then this letter is for you.